102478657 has 4 divisors (see below), whose sum is σ = 103535236. Its totient is φ = 101422080.

The previous prime is 102478633. The next prime is 102478681. The reversal of 102478657 is 756874201.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (102478633) and next prime (102478681).

It can be written as a sum of positive squares in 2 ways, for example, as 23464336 + 79014321 = 4844^2 + 8889^2 .

It is a cyclic number.

It is not a de Polignac number, because 102478657 - 2¹¹ = 102476609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (102478687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 528144 + ... + 528337.

It is an arithmetic number, because the mean of its divisors is an integer number (25883809).

Almost surely, 2^102478657 is an apocalyptic number.

It is an amenable number.

102478657 is a deficient number, since it is larger than the sum of its proper divisors (1056579).

102478657 is an equidigital number, since it uses as much as digits as its factorization.

102478657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1056578.

The product of its (nonzero) digits is 94080, while the sum is 40.

The square root of 102478657 is about 10123.1742551435. The cubic root of 102478657 is about 467.9625962388.

The spelling of 102478657 in words is "one hundred two million, four hundred seventy-eight thousand, six hundred fifty-seven".